Spool for electromagnets.



No; 659,882. Patented Oct. Hi, I900. e. L. WEAVER.

SPOOL FOR ELECTROMAGNETS.

(Application filed Apr. 80 190.0.) (No Model.)

w: Norms PETiRs cu, PNOTO-UTHO. WASHINGTON, o. c

UNITED STATES PATENT OFFICE.

GEORGE L. WEAVER, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO HORACE E.HARRIMAN, OF GEORGETOWN, MASSACHUSETTS.

SPOOL FOR ELECTROMAGNETS.

SPECIFICATION forming part of Letters Patent No. 659,882, dated October16, 1900.

Application filed April 30, 1900.

To LLZZ whom it may concern.-

Be it known that I, GEORGE L. WEAVER, a citizen of the United States,and a resident of Boston, (Dorchester,) county of Suffolk, State ofMassachusetts, have invented an Improvement in Spools forElectromagnets, of which the following description, in connection withthe accompanying drawings, is a specification, like letters on thedrawings representing like to parts.

This invention has for its object the production of a novel spool forelectromagnets whereby should the end of the inside wire be brokenrepairs can be readily made at once 5 without necessitating unwinding ofthe outer coils. It frequently happens that such breaks of the end ofthe inside wire occur, and frequently it is desired to splice such end.In accordance with my invention I provide the outer end of one of theheads of the spool with a recess or magazine to receive a surplus orreserve portion of the inside wire which can be used it" the free endbreaks, the change being made at once and without any unwinding of 2 thecoil, the recess and contained wire being covered by a removableexternal cap or cover.

Figure 1 shows in elevation and partly in diametral section twoelectromagnets secured to the usual yoke, the spools embodying myinvention; and Fig. 2 is an end view of one of the spools, showing thereserve wire coiled in the magazine, the protective cap being swung toone side.

The spool on which the wires are wound 3 5 comprises a soft-iron core orbarrel a and vulcanite or other suitable heads I) b secured thereto, thecore having a threaded opening -66 at one end for the reception of thescrew 8, by which the yoke Bis held in place, the core or barrel beingshown as extended through hubs on the heads. In the present embodimentof my invention I have shown the outer end of one of the heads, as b, asannularly recessed at b to form a magazine and leaving an externalupturned Wall or flange b and in Fig. 1 I have shown an aperture or holeb in the head, through which the free end of the inside wire is led, anda reserve length or sur- Serial No. 14,800. (No model.)

plus to of said wire '10 is disposed in the maga zinc or recess,preferably in the form of a coil or spiral, as shown in Fig. 2. Thesurplus or reserve portion is of sufficient length to provide forseveral replacings or splices, as all that is necessary is to draw oitsufficient wire from the reserve, and the winding is not disturbed inthe least.

I close the magazine with a removable cap or cover 0 of insulatingmaterial, which rests on the top of the wall b and is apertured at c toreceive the projecting end of the barrel a, the cap protecting thereserve wire and also preventing any short-circuiting with the yoke B.

The loose end tu of the inside wire is led out through a hole c in thecap. The outside end W of the wire can be led out through a hole Z) inthe flange b Fig. 2, and a registering hole 0 in the cap.

My invention is applicable to all types or kinds of electromagnets, andthe spools can be used either right or left hand, as desired.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

As an article of manufactnre,a spool for elec tromagnets, comprising abarrel and heads, one of the heads having an external annular recess inits outer end surrounding the end of the barrel extended through thehead, and presenting an outwardly-extended annular 8o flange, saidrecess being adapted to receive a reserve portion of the inside wirewound upon the barrel, the flange forming the side wall of the recess,and a removable cap centrally apertured to receive the end of the barreland adapted to rest on the external wall to cover and protect thereserve portion of the wire in the recess.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORGE L. WEAVER.

X/Vitnesses:

JOHN C. EDwARDs, AUGUSTA E. DEAN.

